The father of a gunman who shot three brothers before turning the gun himself and a woman have been charged after a six-hour siege in Sydney's south-west.

Peter Williams, 52, was taken into custody in handcuffs at the Inline National Signage and Property Services in Ingleburn where his bikie son, Wayne Williams, had holed himself up following a dispute over a sign ordered by the brothers.

Peter was charged with discharging a firearm in a public place and not assisting police with their inquiries on Tuesday, 9News reported.

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The father of gunman Wayne Williams who shot three brothers before turning the gun himself has been charged. Above Peter Williams is seen in handcuffs

A 30-year-old woman, Chantelle Strnad, was charged with not assisting police with their inquiries. The owner of Inline National Signage and Property Services in Ingleburn, in Sydney's south-west, appears above (centre)

A 30-year-old woman, Chantelle Strnad, was charged with not assisting police with their inquiries.

Strnad, who is the owner of Inline, was also arrested at the scene by police during the siege that saw Wayne, 33, shoot three people - killing Michael 'Mick' Bassal, 43, and injuring his two brothers - with his long-arm gun and take three men hostage.

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Peter was refused bail and will appear at Campbelltown Local Court on Tuesday.

Strnad was granted bail with strict conditions and will front the same court on April 4.

The shooting victim of a gunman has been identified as 43-year-old Michael Bassal (pictured)

The shooting at Ingleburn in Sydney's south-west left the 43-year-old man dead and his two brothers injured

Police armed with large guns, helmets and bulletproof vests are concentrating their search for the shooter near Inline National Signage and Property Services

The two brothers shot by Wayne were taken to Liverpool Hospital where one of them underwent emergency surgery.

The second man had 'superficial' wounds to the lower part of his body.

On Monday, the brothers had gone to Inline National Signage and Property Services to complain about a sign they had ordered before the argument became heated and a gun was produced, The Daily Telegraph reported.

Wayne holed himself up and took three employees hostage during the six-hour and 15-minute siege.

The 33-year-old, who is a member of the Finks bikie gang, took his own life before police stormed the building just after 5pm on Monday.

The Facebook of Wayne's victim, Mr Bassal, is filled with pictures of opulent motorbikes and luxury cars and he was known to his friends as 'Mick'.

The shooter Wayne Williams was a Finks bikie member who was involved in a dispute over a sign with the three men, including Mr Bassal (pictured)

Mr Bassal was shot dead by Wayne Williams. Two other men were taken to hospital with gunshot wounds to their shoulder and leg

One of the hostages was Seksane (above) and Monday was his first day on the job

After police stormed the building, the three male employees at the signage business were taken to the end of the exclusion zone to waiting ambulances. They were taken to hospital for treatment.

One of the hostages was Seksane and Monday was his first day on the job.

He had only been working for a few hours when Wayne shot three men about 10.30am.

Seksane, who said he was 'pretty much okay', was busy when he heard gunshots and did not witness the shooting.

'I don't know - I [was] still working,' he told 9News.

'That's the first start to the job, today.'

When police moved in to retrieve the hostages on Monday afternoon, witness Sunia Ram told Daily Mail Australia officers moved into the building 'very casually' and showed no 'urgency in their movements'.

Earlier in the day, police armed with large guns, helmets and and bulletproof vests concentrated their search for the shooter near the signage business.

Mr Bassal's Facebook page is filled with pictures of opulent motorbikes and cars and it appears he is known to his friends as 'Mick'

Police were armed with large guns, helmets and and bulletproof vests as they searched for the shooter earlier in the day

First responding officers on Monday morning found three people with gunshot wounds at the scene

A photo of police officers taken by employee of nearby Above and Beyond Interiors

Police armed with large guns, helmets and and bulletproof concentrated their search for the shooter near the signage business

A witness named Kevin, who works next door to Inline, said he heard the sound of gunshots on Monday morning.

'It was just pop, pop, pop, pop,' he told Daily Mail Australia.

Kevin thought little of it until heavily armed police arrived a short time later and raced through his building and out the back roller door.

Another witness, who works 30 metres from the scene, said he was not aware of the incident until he walked outside.

'There was this body on the road covered by a white sheet, right there, and all these cops around the place,' the man, who wished to remain anonymous, told Daily Mail Australia.

'Then I saw two cops from [Strike Force] Raptor stop this guy with mullet and tatts and search his car.

'They did the same to another bloke who was parked across the road.'

Earlier police were looking for the shooter inside Inline but then pulled back and sheltering behind cars

Officers were at the door of the InlineNational Signage & Property Services taking shelter behind cars as they look into the premises

Peter Williams was pictured in dark sunglasses with his hands restrained in handcuffs behind him and was escorted away by two plain-clothes policemen

The shooter carrying a long-gun gun with emergency services surrounding the area

Police responded to the incident 'within three or four minutes' of shots being fired, according to witnesses

The public order and riot squad were also called to the scene on Monday

Two policemen wearing bulletproof vests, headgear and carrying rifles prepare for their operation

A worker at one of the neighbouring businesses, Konecranes Australia said she heard five gunshots. Above are police at the scene

NSW Police were called to the scene about 10.45am on Monday and responded to reports of a shooting on Heald Road in Ingleburn

The area is described as 'industrial' and the shooter was inside a signage business called Inline

A worker at one of the neighbouring businesses, Konecranes Australia, told the Sydney Morning Herald she heard a total of five gunshots coming from the area.

'We heard five shots. There have been plenty of police and ambulances,' the unnamed woman said.

Paramedics were also called to the scene and were on stand-by as a 1km exclusion zone was put in place.

Surrounding streets were blocked off to traffic and businesses went into lockdown as footage showed police with their guns drawn and taking shelter behind cars as they looked into the premises.

'Police told us not to go near windows,' an employee at a nearby business said.

Inline National Signage and Property Services is a second-generation and family-owned business that was started up in the 1970s selling neon lighting.

The business counts Westfield, First Choice Liquor and postal service DHL as its clients.

A number of police cars and NSW Ambulance vehicles were on standby as the situation unfolded

Efforts to find the shooter were concentrated around the signage business (above)

Two men were taken to hospital. One man had a gunshot wound to the shoulder and the other in the leg

Surrounding streets were blocked off to traffic as footage shows police with their guns drawn

Witnesses say there were two police helicopters flying above the business

Inline National Signage and Property Services is a second-generation and family-owned business that was started up in the 1970s selling neon lighting